Add Haskell zipper exercise
#859 set user.current if attempt is not complete
Update zipper exercise based on @etrepum's comments
Update code.rb

Updated to include objective-c file type '.m' so that submissions work.
Merge pull request #983 from mjansen401/set_current_in_seeds

#859 set user.current if attempt is not complete
Merge pull request #989 from redspike/patch-1

Update code.rb for Objective-c
Add missing instructions to contributing file
Merge pull request #964 from pminten/haskell-zipper

Add Haskell zipper exercise
Merge pull request #984 from sagarsane/java-word-count

Added word-count test exercise in Java track and supporting example.java
Added phone-number assignment test and sammple example.java